[Serusers] Getting rid of SIP URI in Caller ID

[Jiri Kuthan]

At 22:57 03/07/2007, Charles Ulrich wrote:
>Hi all,
>
>I'm fairly new to SER (just heard about it this afternoon), but I've 
>already run up against a problem that's vexing me.
>
>We have a Polycom phone sitting behind a Linksys WRT54G router/firewall 
>with DD-WRT firmware. This version of DD-WRT is the "voip" edition, 
>meaning it has SER and rtpproxy installed to help ease NAT issues with 
>SIP. 

Hi Charles,

Is the 'voip edition' somewhere available? I would be eager to give it
a try on my WRT too.

I'm a bit sceptical how much we can do about it, since the URIs are part
of the SIP protocol machinery and it is up to discretion of a telephone
implementation to show what it wants to show (there is no standard for
what a telephone shall display).

IMO you are then left with experimenting and changing SIP requests in 
a way that increases the chance that the phone shows what you want to
be shown. There is no guarantee however it will work for all phones
in a consistent way.

If I were you, I would try appending P-asserted-identity or Remote-Party-ID
header fields with tel URIs (benefit: use of a header field does not change 
request URI, which might have side effects otherwise, and use of TEL
URI eliminates the domain). If that does not work, I would try to
put TEL URI in request-URI.

-jiri


>No configuration of SER is necessary, we enter the WRT54G's IP 
>address into the phone's outbound proxy field and it just works.
>
>The only drawback is that when using this method, the caller ID on an 
>incoming call from the PSTN contains a SIP URI (in the form of 
>sip:5551212 at 207.179.x.x) instead of a simple telephone number. Our 
>end-users are pretty voip illiterate and thus haven't the slightest 
>clue how VoIP works. They are only going to get confused when a SIP URI 
>shows up on their caller ID instead of the actual PSTN phone number of 
>the person who called them. How can this be remedied?
>
>I can't tell what version of ser is on this device because the -h and -V 
>flags return nothing. (Probably to make it slightly smaller for the 
>embedded platform.) The 'strings' utility wasn't helpful either.
>
>Attached is the ser.cfg that comes with DD-WRT. Any help is greatly 
>appreciated. Let me know if I need to provide more information.
>
>Thanks!
>
>-- 
>Charles Ulrich
>Ideal Solution, LLC -- http://www.idealso.com
>
>
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--
Jiri Kuthan            http://iptel.org/~jiri/